table, th, tr, td
{
    border: 1px ridge lightgrey;
    font-size: 15px;
}

/* Alternating background colors */
/*th {
    background: #3A4953;
    color: white;
}*/
tr:nth-child(even) {
    background: white;
}
tr:nth-child(odd) {
    background: aliceblue;
}

/*导航栏li*/
#menu {
    font:12px verdana, arial, sans-serif;
}
#menu, #menu li {
    list-style:none;
    padding:0;
    margin:0;
}
#menu li {
    float:left;
    list-style: none;
}
#menu li a {
    display:block;
    width:80px;
    height:20px;
    line-height:20px;
    text-align:center;
    padding:8px 50px;
    background:#3A4953;
    color:#fff;
    text-decoration:none;
    border-right:1px solid grey;
}
#menu li a:hover {
    background:#146C9C;
    color:#fff;
    text-decoration:none;
    border-right:1px solid #000;
}
#menu li a.last {
    border-right:0; /* 去掉左侧边框 */
}


.btn { display: block; position: relative; background: #aaa; padding: 5px; float: left; color: #fff; text-decoration: none; cursor: pointer; }
.btn i { background-position: top left; position: absolute; margin-bottom: -5px;  top: 0; left: 0; width: 5px; height: 5px; }
.btn span { background-position: bottom left; left: -5px; padding: 0 0 5px 10px; margin-bottom: -5px; }
.btn span i { background-position: bottom right; margin-bottom: 0; position: absolute; left: 100%; width: 10px; height: 100%; top: 0; }
.btn span span { background-position: top right; position: absolute; right: -10px; margin-left: 10px; top: -5px; height: 0; }
* html .btn span,
* html .btn i { float: left; width: auto; background-image: none; cursor: pointer; }
.btn.blue { background: #2ae; }
.btn.green { background: #9d4; }
.btn.pink { background: #e1a; }
.btn:hover { background-color: #a00; }
.btn:active { background-color: #444; }
* html .btn { border: 3px double #aaa; }
* html .btn.blue { border-color: #2ae; }
* html .btn.green { border-color: #9d4; }
* html .btn.pink { border-color: #e1a; }
* html .btn:hover { border-color: #a00; }
p { clear: both; padding-bottom: 2em; }
form { margin-top: 2em; }
form p .btn { margin-right: 1em; }
textarea { margin: 1em 0;}